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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf946eea60e8f1ac38886c701b5691b7d80bf80dcc4836e5ef5fe8dbb518b80' 
  AND token = 'Hisg2jiDwR1e28u5QDhI9zjWNleygBe+f0KGtBZSaWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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