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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad2b6144b644836a90ac3067b3d3e8fc2fad0fc67c6c259e35543452afa7f74' 
  AND token = 'qTtM+sh2jiAjSSViJfblTuANzglIgWHA0sZT3gYcQec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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