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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2376b0b1ebcf05ac978af9bb38ff5bb7dbb892fa4213945b2150a8145f9d0c' 
  AND token = 'tTiWrFXYzfy0ECS8Bog6JyxmbjJtwryp4a2v3VWn/Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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