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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ba6f3e51473856614f54283e003eb720ff818cd8eca9c0125a6019cb86cdb9' 
  AND token = 'SpnCRoAajkwsK8A6nFNb8/aRU/Ffg5H45YYUbogoIaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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