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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3c3a3ee96c524ed63e34cfeecad1c938343a306043c4dab7dbd86b4c622238' 
  AND token = 'jC3DrsGRCYWy2t7ZK2Ae0VKy5ZiA4YG0zfj/tltcgAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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