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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56562ac2eb0f5240f19b0c806fd1e59396b8f81042b784e2fa2d15af73fd1bc' 
  AND token = 'qfNKuD4kPWiRdE+EyyCvymqZxC0ZZB01h3rUFfd92GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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