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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cde94d3e38ed04d3082898634f433bd9da1628822c0af63a0d416a50b9f3900' 
  AND token = 'vlPDmEvfuiiatUs7uw2VA7Lz/3usACdW7tBgr8pFjUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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