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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d0ed04c2cea9ea27075e8d1d6fcae04904dc14b8870aee5016e9617caeec61' 
  AND token = 'OuUrEBifllPhQrLbEL7RwNA89oyp/WbHfc+v0Y1I6yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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