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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b1e859b0b3169033c5b70e5eb3cefe0b823c84216ce92760c4437c540e799e' 
  AND token = 'hmxXAtHnBO15MbQFBPGeGtG3POCMypziuEAT+nJ5V2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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