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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55806b93c9f32bfcef65e86786a5b671d292fa90ab3e3989855b01daa599b012' 
  AND token = 'K8HUuuv3FWzDTV1M4RQ2wSHETa1yyQ+qt3rBkUwx3dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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