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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8027ea172fdc6bb0e8680510875a1cc2cb419bcbf6627ced0ce2325e73c2234d' 
  AND token = 'pPAtX6GYmE01WP6kailYPWXwbYqHislz2ByCmmGHkEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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