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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09fd1954a75b55d145d2121d9d055f43b0be9977f84da653e54a4a1fc21e8d19' 
  AND token = '9xk+KTlsaQfnvf0xOudK5PcVwFww4wspEJGLqc9r3YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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