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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1db4f55b5345e59d54a8408bb9a8fc82793485fe6299b2aa36cc160ed019f4c' 
  AND token = 'r9DsX4a82IVQ/l/uL5U5oa7W1WoA2wdWbN232Tji3+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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