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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc885b32249b6258929dc535083d1574004805dcb71afb43e214d2468585ab43' 
  AND token = '0sdNw45AK4qbxTXWFMP6FAkfhg/Q0Jf3TJoBlcBd3qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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