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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00318ca73ef42c1e915b707498cd8f502c8f3fe84f63e69eea273ea4138f9c93' 
  AND token = 'VT+XXG+JiKwqnGSsCrGauX3Nqo4KJAa9wqrj+q2Jqyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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