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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b94a89dfae593e521cef2f6284c5334128874c5836a50788d7ede54929d2d34' 
  AND token = 'AtR3V+4ZzHtEqFsMxC97UQFpu2sgR2tr7P6Zzzc1lBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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