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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c2309fb6f40225d88819d686826164d5a631c93c46c319008151d2a25c1b50' 
  AND token = 'dMLG5+RWSDsOLE9Fm/mTWwqI1M6rRRlCjnVh2d/IWuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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