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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e095329633f55ccb970d8b8caa979f159cb970db0388c6250b213857e1b846c' 
  AND token = '0yRZKKKPOWhmxhjUgH6YV0IOkuwsu7DVknYoi7HRDOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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