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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11bd85277db7ff6ecfd6e08f4be311ff77b0828dca606ea095e28e6b6403b2f9' 
  AND token = 'Lqe9bWcQMwhz4XXi9R0ppEMyHVojaCOeD5ZoR8Uq8H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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