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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e52410b0dd992e847cfd3db9055a66a64cce162f7fc3f57ba37954b7f56cd94' 
  AND token = '5Vyt6lrtHGMdg2E4ybgGlekEWkkKMSzbVaux4gwJUZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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