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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd997d6e9f27296114ffc4966fe16d56af654b2f8ad8122b6b93974a773f379' 
  AND token = 'eBuFO/UGrXMvuX/BzWD01qovUcYjM6kun7QWIEugu6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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