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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1d8f0c379d309aed36c9b1ee70190ea0b1800b7a181f7b6aa3b94cdbe3f0b5' 
  AND token = 'hin1+N1wfbQ5YIvJY4JU3RCw0tKGLg3uTXGqiXPkHVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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