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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269dc49a072e3ceaa702027a87b676a811bb92ce58b11021b3cad94f24d46fca' 
  AND token = 'KFrJFHoirwj8/Dlt6bgOzhVDoFAKnZkRbEHCrTMOKDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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