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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af04f52a050a7a7dafb1231224f435d2996a2dce1a91e18ee2a8108a89ef8f8' 
  AND token = 'ORGzTlfiK5WlasY0geHcoi1yPoFv9Xso/GrUUoS4T34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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