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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fd3f7787305a30d3b17e0926f172d793e8d8e5919f132042ce3b3ac96fc93b' 
  AND token = 'XrWoh6oc4GbfKhw7RzHfhLjyCN70DvkRDKot4QUfePk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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