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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac85460c9b23024301023472de8a65db50bd3a23c3e55fbdb96161b9ac46cee' 
  AND token = 'Vw2KEop6Rv8GmwfRtDXv5r8bYazMj9meYYXbdfDWHAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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