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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9e673fdd4c42eb9d41be9d02e092b11721b6a6b58de4e0e7cb3d1ca4696e28' 
  AND token = 'ww9Qtg65dZvgb/yEfCVH/cjCaOAMTrHCphafmRPR+ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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