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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc78e79f3e499e428d8e2945e7ea07f3a3c3a7e2231f44f0592e2f7c0d089c1' 
  AND token = 'ToGjfzqjFkvHTvlVjrPiklcVtKi3A7Mrg/ncHIulHPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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