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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802fc30cc0dff33ea46afd80d092f09c8a6e69752e4a9a213c9e098f8cfbde64' 
  AND token = 'IjIWHTRin3KU70pOeNfJ/hpXGeZkCzIT7fszj46I7kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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