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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afa6e0b0bcbf4852249faf68f7d305c441cdf8fd9993420c04b46b7b32c0e40' 
  AND token = 'n9cS6R/rKWJFD5dvlxEOI3GSLPFMyiK4cMJ+Dzm2jHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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