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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915c7c7abae5335d5ff243d9850085d2fa286de625c69fd9bec57760c2e75a5e' 
  AND token = 'BKtEe0v9yPgE5Yaip3w/WYifNcQWj8eP3Dukw7vnklI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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