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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5db9a1fdf742b0a4bf958f9efa5f7885c7f070f4b3ebc24ce37a5b301771782' 
  AND token = 'xnYheYvmP3ztAKCq3w1xAZAx2WN77AwY90pTeBiDUhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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