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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047ac1146c5c65d8160cfdf12d69e1981566b1e43de14f6cfe8f1565f3b0c996' 
  AND token = 'RHCRUMscCd+zlfG1R9Yv14IuQZWDBEMtpkZ2BVGqE9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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