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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b1747f6f613596d7be3fc0da338b5af7d46095f5894b3f4c30502ee8692d5b' 
  AND token = 'ZxiyKR1FspkGEUf1+Dl59EfVkYKeH/tplX3DOV1Kz2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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