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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06761bda88db9c22dffe60acc529f5701061ef4bb47e013af6ba3f7137d908b1' 
  AND token = 'cvBKVS6PwNoX9m6/WW2NOTDLieyuyGAO/TewK6xWo5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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