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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b400efa141aa6ceca14fae8b80c262421f3f63f9e48cd7a734c9b23ff04b07' 
  AND token = 'XJ3XogS6uawOjY8djT1tozzZX4e2sJgDvY9bVG+S0sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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