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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393273b7e87e8397577466096a74c39d185ce40242f8c40e85ac7fee02101fa7' 
  AND token = 'EG7Rqt1Ax/iPWm3AJrM9TxEjINaO1XhXfE8kBr38pWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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