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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2404116dd57cad5941563c1fe3f535a3755c35cb2b1de7b8ef18fdc846f04501' 
  AND token = 'oQQcU0QuHsFwccA3jEa3S6IzG93SK2kGAZccqLYpgUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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