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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1a7feabb9e3f3a7bee39a7f0d895c2a9a28eb1048eda861bbb507fa298f2d6' 
  AND token = 'NyTlUzNHESNoy2f3KL394W4h58eGKHf5hK02L3DDIT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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