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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7ac67ee4a6e0fc256c73aa080ea685546fd0c11b24d6f950d15905ee7d657a' 
  AND token = 'bIea+SZP9zleV3ucZKm5oZeBTDusGmz0/w6WHvo8/L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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