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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08faa80aacbffa6d17050bc989e785f920a753769447d9b59523e204ba1f7e7a' 
  AND token = 'UdcgpNgSXS6GlV6DWbjgG+9dUTW+3EOaAs6HZbbX8p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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