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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ecf2269b9db86c921b278439172d0aa27949ea3d1acbb07d29b5428b4444cd8' 
  AND token = 'BuWBl67+Zt0gMw7rr7IKvu420hpJOt8Dj/jyhLlOQbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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