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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328149915a5d945d242ae79769c2583723dba33e6ccc6da3504bb386dce14c5c' 
  AND token = 'usuVxMheuc3YDZXT5KJqPyEr6tBA1RlHML7PRA+80jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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