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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1101d11968a0682fe6b02b523ce69daaebf9571d874816a837bf893caac4e53d' 
  AND token = 'JLrP3y8J4cAL0t7RSer3Ibz5N5v0AyEkbjn9SrIBH4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}