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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23992eeb352ab0338de338e6cc582031f7f1e861a6f8eac880c8d2e7fc858ba7' 
  AND token = 'VGOjMUlVz4enqmom6braLkbjAbCLhOuM8DpyDp/mO3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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