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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9476e62c9e16619b43ee4bd849edf63c1eb7dee69a044356283b8d0bf9472d7' 
  AND token = '4O3vRbimYH9iQMTAWgbvJAAYQWPVgzVe0XNaquYEA5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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