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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f00156829acb98b5916ef2bc791fc73b748cb4274019cc41429a358f0f40a9c' 
  AND token = '93SCM41t3uDWA9qTzozXtqBiS7UnBKaplQtrUQNH1Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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