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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad239e69782b86a8295aea1ad191ed0dec4d921db434d4458730598e7a159c4' 
  AND token = 'rsYcOxvGdUKkx4IBce0506LyOyA3q46J77GuU3Y8Bjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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