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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43c34eaf130bb0a00bb1b58a65b3569ff154fc0501f9a6b48a0dacd84ef8a4c' 
  AND token = 'pHJvQxj2re2MqIWPO4gs4ggIMEo0sNk2DkN4sod+wyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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