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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f551b7c15c5a91112493bce088fd119c51e90e3a44c8faba07ef0a8c18077bb6' 
  AND token = 'MtWS71GZ1QAVaFfmawgturSvuMd4gxwgseNg97klD28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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