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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa4c2eea13d04bd7da1b890b477ac08db1c53b6108abe511065eb3a6f62a09b' 
  AND token = 'mLXLHTPcahUzeF88TCV4Y1ChYz/I1Mn+PAzdl6WKIGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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