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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4369ed285c2af11fc52f9c475d0d859d771e567a3363c576b7ab5b38c89bdd9f' 
  AND token = 'qa875BRzeef+/MrOmr5jGxotVeXH19+mpaSkzYBsHTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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