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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcdc970c3590cf8886e92d15ca0e07a2158250012620abde1233776fb632c04' 
  AND token = 'tIjP+9etyhwhc1qhO0adzCfeNZJa8oOkQgdZ9RoufbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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