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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a83add7f3f12c35289c073f9c916878160b11efb235d6e4ef6b380a7175040' 
  AND token = 'JK7s8hyN9tn8uEo+8I0pRbmPRgJpsIVKV70/PLOkOJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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