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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d97b0b1674f033b1c368ecb080f439876d649556eec9f8f594260e3261d901' 
  AND token = 'nPqeTdE911eZprUtpJAXT3MhxnOFcKQq3wt3ExgYBzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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