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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94234a167d371790c3bc5741069bf5c597bb7a0c8bc4777ccb5d3f7793677014' 
  AND token = 'WlHQmTGxMg4maEswguniArCRe/VVs4XZecxiOLOZDr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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