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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6abe26f56eebec564059c3f148da0e6a76c2c38d1e3190cf82bc673daa796bd' 
  AND token = 'fOpvcX5GBntrIS2lZv8dvnD0IgS7PzIgPnf2nhEi62E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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