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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17dac7160846d49a6c8ae8faec08e5430979e84760ec8c75d3c112092d6a4517' 
  AND token = '7B6YbC11tGzsVctLfrGgLoYYL6qAJ3Unz/5Ybz5vnkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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