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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d51aa7449a9209efb3fbf16f6d48e903bfad9bcd25d198a925162d9733bdbf' 
  AND token = 'r8zToJ+4a9V44XsFpekwAsANI9wpBFmKA25oBGNYBxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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