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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f5c8c49eddabea81b2343d1cd35ab7b8a4a540e71d2eaa78df1b43c05e6b91' 
  AND token = '+zQwRfHvsdaTMcd8Oh3y8sA1jYuPCl3EsD61Rh9zLgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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