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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e110cfa51ceca4c31e4db5f4a16b726aebe6eede5ad783efdbfd28a7bab7bf' 
  AND token = 'Wx5899axUuVLrc8amN0u0SmZ22HruwXSvroBWCnMdV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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