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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bdb762a9188837f94f3db7715afb0f6fb54711c0509b25f8393d2b548ffd72' 
  AND token = 'ZaNz5d5SSlL5xnCs489GFzbrJP5JRWP+TvbpaSyfyRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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