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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '355f2f293197b3238884dcc20ed81b485785cd7a88290836d07dbf4e2766ef5a' 
  AND token = 'nRfCK8k2AMy2RJkjoRLmR5MyHuRBd6eCkBYTinFk44s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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