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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c1d91080feb431bcf511080d925e8f0f6cff8527887d8172e92bc302e9f7de' 
  AND token = '5ZJdBlrvTNRdRIqbVWU/Ap3dFeNbF11L1XWu7//Vljw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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