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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ab1269e90f3ce6a668c5678729d4b72f03ca347c73b49e5450e0a0031871ae' 
  AND token = 'RhCZBzVAC7xqDbPdo5hEaiCLAPP+D0uh1D4L5kXZyZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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