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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07371ca9f288ff875ceee79d2e06cf640be703aa9e2935c3eb0306d2c092471f' 
  AND token = '1T5Gsz8Lx6YkKRM4ifKqRz73J0K7n/MZq/uJbRilQOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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