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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca447091d5179991475cad8f1bccf3350f68c31b7a25ef3d749ebb3cff9134f7' 
  AND token = '3BrDF801XRcZ8WLLM9ceEgC5UCCMrGLJtIvUxNT4Id0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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