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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32898dadcba445385ca8c8a8e2d0f2ecd74678af6f31567e6e5657f5956b0383' 
  AND token = '5p2PMf9f66FSLCswF5OXiWDyty22eu4tH1AvWvBWITQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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