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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb8d212dc220a5456851443cab6018457945e1dad07015b39f165f5616703d5' 
  AND token = 'nXSXGDpoJEpGq7KTIif99iI5JfDdERL9hwwi8hbBfsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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