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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244c34c6bd5f89eaf75327a137ea35a9a3cf341b24a3dc5b35bd64ef98ec5c09' 
  AND token = 'YF/5e5gNxZv5J13VOVEm24A7HTwCXDNtknAIGf+zVrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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