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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df5550016c3841dcbde2124d92ccb6401db5b14655802fc108aaac1ea64f21d' 
  AND token = 'zA4VX4tFRr26rFMGr0wyxh2ZM/v9J5tao5ZGCdboKjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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