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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47d2f27246210227c01eadcd3b2d21f584053feee3c59d085196e3dc0336f8b' 
  AND token = '0y5aygXHKo8J45Jt49REvJg0G4vRDkbJjXo/zW08PJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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