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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968535afe4f005d5568207df8b0d53836a20cc5700104209020ce6c8d0c6b5b1' 
  AND token = '5wjo1F4tNDBUCv2+XV8JO48HPoiK72CtgirtIrhSYFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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