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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd513c89e75dd5b27baef0e5ebce843e0a08e8646ad5b1617a0e1d3a9f4be00' 
  AND token = 'QkL6mi/wNliIXOgwmrXJPQCBsZkOyewLoKlsKYF6C54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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