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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502f9f4ca26314ffdaf140dfd97d35bfd7365916ed69897219c1f84849ac01ae' 
  AND token = '6q3I2m5gdLvHNVQtO8ExOUVE4eCH22Tvq0QxKLKMYU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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